Fix symfony command completion 'permission denied'

plugins/symfony/symfony.plugin.zsh

 # symfony basic command completion
 
 _symfony_get_command_list () {
-    ./symfony | sed "1,/Available tasks/d" | awk 'BEGIN { cat=null; } /^[A-Za-z]+$/ { cat = $1; } /^  :[a-z]+/ { print cat $1; }'
+    php symfony | sed "1,/Available tasks/d" | awk 'BEGIN { cat=null; } /^[A-Za-z]+$/ { cat = $1; } /^  :[a-z]+/ { print cat $1; }'
 }
 
 _symfony () {